<template>
  <div class="magnifier">
    <!-- 放大镜 -->
    <div class="left">
      <img class="leftImg" :src="imgUrl" alt="" />
      <!-- 鼠标层罩 -->
      <div v-show="topShow" class="top" :style="topStyle"></div>
      <!-- 最顶层覆盖了整个原图空间的透明层罩 -->
      <div
        class="maskTop"
        @mouseenter="enterHandler"
        @mousemove="moveHandler"
        @mouseout="outHandler"
      ></div>
    </div>
    <div v-show="rShow" class="right">
      <img :style="r_img" class="rightImg" :src="imgUrl" alt="" />
    </div>
    <!-- 右侧滑入切换图片 -->
    <div class="RigHover">
      <img 
        v-for="item in pict"
        :key="item"
        :src="item" 
        alt=""
        class="HoveClass"
        v-on:mouseover="Hover(item)"
      >
    </div>
    <!-- <div v-if="propert" class="bottom_box">
      
    </div> -->
  </div>
</template>

<script>
export default {
  name: "MagnifierView",
  props: {
    pict: Array, //放大镜所有图片
    properties:Array, //品牌信息
  },
  data() {
    return {
      imgUrl: "", //图片路径
      propert:[], //品牌信息
      topStyle: { transform: "" },
      r_img: {},
      topShow: false,
      rShow: false,
    };
  },
  mounted() {
    if(this.pict.length){
      this.imgUrl = this.pict[0];
    }
    if(this.properties.length){
      this.propert = this.properties;
    }
  },
  methods: {
    // 滑入
    Hover(res){
      this.imgUrl = res
      // console.log(res);
    },
    // 鼠标进入原图空间函数
    enterHandler() {
      // 层罩及放大空间的显示
      this.topShow = true;
      this.rShow = true;
    },
    // 鼠标移动函数
    moveHandler(event) {
      // 鼠标的坐标位置
      let x = event.offsetX;
      let y = event.offsetY;
      // 层罩的左上角坐标位置，并对其进行限制：无法超出原图区域左上角
      let topX = x - 100 < 0 ? 0 : x - 100;
      let topY = y - 100 < 0 ? 0 : y - 100;
      // 对层罩位置再一次限制，保证层罩只能在原图区域空间内
      if (topX > 200) {
        topX = 200;
      }
      if (topY > 200) {
        topY = 200;
      }
      // 通过 transform 进行移动控制
      this.topStyle.transform = `translate(${topX}px,${topY}px)`;
      this.r_img.transform = `translate(-${2 * topX}px,-${2 * topY}px)`;
    },
    // 鼠标移出函数
    outHandler() {
      // // 控制层罩与放大空间的隐藏
      this.topShow = false;
      this.rShow = false;
    },
  },
  // watch:{
  //   pict(){
  //     if(this.pict.length){
  //       console.log(this.pict[0],'-----------------------------------');
  //     this.imgUrl = this.pict[0];
  //   }
  //   if(this.properties.length){
  //     this.propert = this.properties;
  //   }
  //   }
  // }
};
</script>

<style scoped>
  
.magnifier{
  position: relative;
  width: 100%;
  height: 100%;
}
.bottom_box{
  position: absolute;
  bottom: 10px;
  left: 0px;
  width: 400px;
  height: 80px;
  background-color: red;
}
/* 右侧滑入 切换图片 */
.RigHover{
  width: 80px;
  min-height: 400px;
  position: absolute;
  left: 410px;
  top: 0;
  display: flex;
  flex-wrap: wrap;
}
.HoveClass{
  width: 70px;
  height: 70px;
  margin-bottom: 5px;
  border: solid 1px #ccc;
}

/* 放大的图片，通过定位将左上角定位到(0,0) */
.rightImg {
  display: inline-block;
  width: 800px;
  height: 800px;
  position: absolute;
  top: 0;
  left: 0;
}
/* 右边的区域图片放大空间 */
.right {
  margin-left: 412px;
  width: 400px;
  height: 400px;
  border: 1px solid rgb(91, 91, 91);
  position: absolute;
  top: 0px;
  left: 10px;
  z-index: 9;
  overflow: hidden;
}
/* 一个最高层层罩 */
.maskTop {
  width: 400px;
  height: 400px;
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
}
/* 层罩，通过定位将左上角定位到(0,0) */
.top {
  width: 200px;
  height: 200px;
  background-color: rgb(134, 127, 127);
  opacity: 0.4;
  position: absolute;
  top: 0;
  left: 0;
}
/* 原图的显示 */
.leftImg {
  width: 400px;
  height: 400px;
  display: inline-block;
}
/* 原图的容器 */
.left {
  width: 400px;
  height: 400px;
  border: 1px solid teal;
  float: left;
  position: relative;
}
</style>